Fig. 3From: Thoracoscopic infrared ablation to create a box lesion as a treatment for atrial fibrillationEndoscopic view of the left atrium. a Ablation of the left side of the roof of the left atrium. Several overlapping lesions were created to form a linear lesion. An ablated discolored lesion is clearly visible. b Ablation of the left side of the bottom of the left atrium. A wide, clear visual field can be obtained with a 45-degree endoscopeBack to article page